A. olivine
B. basalt
C. mica
D. calcite
E. obsidian
F. feldspar
What fraction of the mass of the crust consists of this mineral?
A. between a quarter and a half
B. between half and three-quarters
C. more than three-quarters
2007-03-27 09:09:10 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
Feldspar is the most common. i would have to say between half and 3/4.
2007-03-27 10:24:30 · answer #1 · answered by Tim K 2 · 0⤊ 0⤋
Olivine is limited group of minerals and found mainly in mafic and ultramafic rocks
basalt not mineral it is a volcanic rock composed essentially of pyroxene augite and plagioclase felspar mainly labradorite some time has some olivine.
micas are widely distributed in nature and often are rock-forming minerals. The total amount of micas in the earth's crust is approximately 3.8% principally in acidic intrusive rocks and in crystalline mica schist
Obsidian is the glassy varity of grainte and characterized by vitreous luster in hand specimen and mainly not common
Calcite is one of the most widely distributed minerals in the earth's crust and may form whole massifs (limestone mountains)
feldspares are the most widely distributed silicates in the earth's crust making up some 50% of it by weight
2007-03-27 09:48:37 · answer #2 · answered by eldeebminex 2 · 0⤊ 0⤋
F. Feldspar is the most common, either in granitiods (most of continental crust) or basalt/gabbro (most of oceanic crust).
I/m not sure of the percentage, but it is more than half. My educated guess is B.
2007-03-27 09:17:45 · answer #3 · answered by QFL 24-7 6 · 0⤊ 0⤋